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  <section id="math">
<span id="command:math"></span><h1>math<a class="headerlink" href="#math" title="Permalink to this heading">¶</a></h1>
<p>Evaluate a mathematical expression.</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">math(</span><span class="no">EXPR</span><span class="w"> </span><span class="nv">&lt;variable&gt;</span><span class="w"> </span><span class="s">&quot;&lt;expression&gt;&quot;</span><span class="w"> </span><span class="p">[</span><span class="no">OUTPUT_FORMAT</span><span class="w"> </span><span class="nv">&lt;format&gt;</span><span class="p">]</span><span class="nf">)</span>
</pre></div>
</div>
<p>Evaluates a mathematical <code class="docutils literal notranslate"><span class="pre">&lt;expression&gt;</span></code> and sets <code class="docutils literal notranslate"><span class="pre">&lt;variable&gt;</span></code> to the
resulting value.  The result of the expression must be representable as a
64-bit signed integer. Floating point inputs are invalid e.g. <code class="docutils literal notranslate"><span class="pre">1.1</span> <span class="pre">*</span> <span class="pre">10</span></code>.
Non-integer results e.g. <code class="docutils literal notranslate"><span class="pre">3</span> <span class="pre">/</span> <span class="pre">2</span></code> are truncated.</p>
<p>The mathematical expression must be given as a string (i.e. enclosed in
double quotation marks). An example is <code class="docutils literal notranslate"><span class="pre">&quot;5</span> <span class="pre">*</span> <span class="pre">(10</span> <span class="pre">+</span> <span class="pre">13)&quot;</span></code>.
Supported operators are <code class="docutils literal notranslate"><span class="pre">+</span></code>, <code class="docutils literal notranslate"><span class="pre">-</span></code>, <code class="docutils literal notranslate"><span class="pre">*</span></code>, <code class="docutils literal notranslate"><span class="pre">/</span></code>, <code class="docutils literal notranslate"><span class="pre">%</span></code>, <code class="docutils literal notranslate"><span class="pre">|</span></code>, <code class="docutils literal notranslate"><span class="pre">&amp;</span></code>,
<code class="docutils literal notranslate"><span class="pre">^</span></code>, <code class="docutils literal notranslate"><span class="pre">~</span></code>, <code class="docutils literal notranslate"><span class="pre">&lt;&lt;</span></code>, <code class="docutils literal notranslate"><span class="pre">&gt;&gt;</span></code>, and <code class="docutils literal notranslate"><span class="pre">(...)</span></code>; they have the same meaning
as in C code.</p>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.13: </span>Hexadecimal numbers are recognized when prefixed with <code class="docutils literal notranslate"><span class="pre">0x</span></code>, as in C code.</p>
</div>
<div class="versionadded">
<p><span class="versionmodified added">New in version 3.13: </span>The result is formatted according to the option <code class="docutils literal notranslate"><span class="pre">OUTPUT_FORMAT</span></code>,
where <code class="docutils literal notranslate"><span class="pre">&lt;format&gt;</span></code> is one of</p>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">HEXADECIMAL</span></code></dt><dd><p>Hexadecimal notation as in C code, i. e. starting with &quot;0x&quot;.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">DECIMAL</span></code></dt><dd><p>Decimal notation. Which is also used if no <code class="docutils literal notranslate"><span class="pre">OUTPUT_FORMAT</span></code> option
is specified.</p>
</dd>
</dl>
</div>
<p>For example</p>
<div class="highlight-cmake notranslate"><div class="highlight"><pre><span></span><span class="nf">math(</span><span class="no">EXPR</span><span class="w"> </span><span class="nb">value</span><span class="w"> </span><span class="s">&quot;100 * 0xA&quot;</span><span class="w"> </span><span class="no">OUTPUT_FORMAT</span><span class="w"> </span><span class="no">DECIMAL</span><span class="nf">)</span><span class="w">      </span><span class="c"># value is set to &quot;1000&quot;</span>
<span class="nf">math(</span><span class="no">EXPR</span><span class="w"> </span><span class="nb">value</span><span class="w"> </span><span class="s">&quot;100 * 0xA&quot;</span><span class="w"> </span><span class="no">OUTPUT_FORMAT</span><span class="w"> </span><span class="no">HEXADECIMAL</span><span class="nf">)</span><span class="w">  </span><span class="c"># value is set to &quot;0x3e8&quot;</span>
</pre></div>
</div>
</section>


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